Nugroho, Novan Arum, Sapta Kunta Purnama, Slamet Riyadi, Rony Syaifullah, and Dimas Duta Putra Utama. 2023. “Serve Exercises With Eastern and Continental Grips Which Is Better for Beginners Improve Skills”. Journal of Human Sport and Exercise 19 (1):15-22. https://doi.org/10.14198/jhse.2024.191.02.